Effect of manganese toxicity on growth and N2 fixation in groundnut, Arachis hypogaea uri icon

abstract

  • The development of manganese (Mn) toxicity symptoms and its effects on the growth, nodulation, and nitrogen fixation of groundnut genotypes were examined using a quartz-sand/solution culture system. The 11 genotypes tested all accumulated considerable concentrations of manganese (1.04?3.07 mg g-1dry matter) when supplied with 15 ?g Mn ml-1of nutrient solution daily. Toxicity symptoms differed between genotypes: some showed no visual effects, some produced marginal leaf spots, and others developed marginal leaf spots coupled with an inward rolling of the margins of the younger leaves. The growth of one genotype (ICG 5394) grown with inorganic nitrogen as its source of N was more severely affected by Mn toxicity than when dependent on symbiotic fixation for its nitrogen

publication date

  • 1989
  • 1989